The men, who lived in Santa Paula with their wives, are wanted for murder and attempted murder in the Sunday shooting at Teague Park that left Javier Tellez Garcia, 27, dead and his cousin, Jose Tellez Vasquez, seriously injured.

Gonzales said the Tellezes' brother apparently firebombed Garcia's car in Mexico. Garcia was instrumental in collecting testimony that aided the prosecution against the brother, who was sent to prison in Mexico, Gonzales said.

Police are also investigating other incidents that may have led to a family feud, Gonzales said.

Gonzales said police, worried about the possibility of retaliation among family members, are keeping an eye on the neighborhoods where family members live.

"We don't know what's going to happen," Gonzales said. "The immediate family members of the deceased appear to be very sincere, however, they're very upset."